Analysis and countermeasures on 220 kV and above transmission line lightning trip-out

Therefore the frequency of lightning trip-out has been greatly reduced.

The statistics of lightning trip-out rates of transmission line of Guangyuan Electric Power Bureau over the years are carried out.

Regarding the special topograph and landforms,It particularly analyses the characteristics,reasons,and preventive measures of lightning strike of 220 kV and above transmission lines of shanxi power network,and puts forward the countermeasures.

By analysing the reason of lightning trip on 10kV power continuous line of integrated load,combining design and research of electric power engineering of JiuJinQu railway,some reasonable lighting proof measurements are bringed to improve lighting proof level of power continuous line.

For the transmission lines under operation,lightning outage rate can be converted through frequency of lightning outage and line distance.

Basing on Generalized Integral method,completely reckoning in the tripout by induced lightning, the total lightning outage rate we have obtained.

Evaluation of lightning trip-out rates for Zhejiang Power Grid by using lightning location systems;

There are two indexes to evaluate the power line performance on preventing lightning strikes: the one is the lightning trip-out rate,the other is the lightning withstand level of the power line.

According to these records,the causes of lightning flashover including shielding failure stroke and back-shielding failure stroke were analyzed and therefore shielding-failure stroke rate and lightning trip-out rate were obtained.